adding unit test

Author: Jonathan-Birkey

.classpath

@@ -2,5 +2,7 @@
 <classpath>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
 	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="src" path="test"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/5"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

.github/workflows/superlinter.yml

@@ -25,5 +25,5 @@ jobs:
         env:
           DEFAULT_BRANCH: main
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          VALIDATE_ALL_CODEBASE: true
+          VALIDATE_ALL_CODEBASE: false
           JAVA_FILE_NAME: java.xml

.project

@@ -14,4 +14,15 @@
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
 	</natures>
+	<filteredResources>
+		<filter>
+			<id>1708804304551</id>
+			<name></name>
+			<type>30</type>
+			<matcher>
+				<id>org.eclipse.core.resources.regexFilterMatcher</id>
+				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
 </projectDescription>

test/chapter01/TestExercise01.java

@@ -0,0 +1,33 @@
+package chapter01;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import org.junit.jupiter.api.Test;
+
+import com.github.jonathanbirkey.chapter01.Exercise01;
+
+class TestExercise01 {
+
+  @Test
+  public void testPrint() {
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    PrintStream ps = new PrintStream(baos);
+
+    PrintStream old = System.out;
+
+    System.setOut(ps);
+
+    // execute Exercise01 main method
+    Exercise01.main(new String[0]);
+
+    System.out.flush();
+    System.setOut(old);
+
+    // test method
+    String expected = "Welcome to Java, Welcome to Computer Science, Programming is fun.";
+    assertEquals(expected, baos.toString());
+  }
+}